package com.military.filter;

import com.military.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")//拦截所有请求
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse  response = (HttpServletResponse) servletResponse;

        //1.获取请求路径
        String requestURI = request.getRequestURI();//  /employee/login

        //2.判断是否是登录请求,如果路径中包含/login,说明是登录操作,放行
        if (requestURI.contains("/login")){
            log.info("登录请求...放行");
            filterChain.doFilter(request,response);
            return;
        }

        //3.获取请求头中的token
        String token = request.getHeader("token");

        //4.判断token是否存在,如果不存在,说明用户没有登录,就返回错误信息(401状态码)
        if (token == null || token.isEmpty()) {
            log.info("请求头中无token或者为空,返回错误信息(401状态码)");
            response.setStatus(401);
            return;
        }
        //5. 如果token存在,校验令牌,如果校验失败,则返回错误信息(401状态码)
            try{
                JwtUtils.parseToken(token);
            } catch (Exception e){
                log.info("令牌非法,响应401");
                response.setStatus(401);
                return;
            }

            //6.校验通过,放行
            log.info("令牌合法,放行");
        filterChain.doFilter(request,response);
    }
}
